{
  "manageEntity": {
    "action": "Save",
    "entityId": "1123774792",
    "entityType": "Track",
    "nonce": "0x13110b684c606c3b03e665f63643acf443956ad7b8ccfa80997c8bee37d0a375",
    "signature": "0xae3298c8fabf8d12140518d4df44b659c8b0099680e81f6cfb985362145782af53513c852619f2c280fd07453fba5a6bf985339edec02039dd541bd711a8405f1b",
    "signer": "0x4950A7c498b6c214e83B79502162b7f248f9e6ed",
    "userId": "499895630"
  }
}